It states very clearly in the OP that history is unchanged up to the end of WWII and yet folks keep proposing apps with alternate histories pre-dating 1945 as though it were not there in plain text for all to read.
"Point of No-Return
Everything up to the end of WW2 happened, which was in 1945. Everything up to 1945 happened, but whatever happened after that can be altered to your liking."
This is baffling to me. Like, why is there even a question of a Confederate States of America when the Civil War had been for 80 years prior to the end of WWII? There is zero potential for a Confederate America in the 1983 Reagan Administration, let alone any time after the start of the Cold War, the space race, the Moscow Olympics, and all the red-white-and-blue-blooded All-American America-ness.
And just for clarity, this tone of this post isn't intended to be as remotely as ranty as it probably sounds.